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MPLS over Ethernet issue

  • From: "Per Hansen" <perflemming@hansen.mail.dk>
  • Date: Sun, 22 Sep 2002 12:38:23 +0200
  • Importance: Normal
  • Resent-Date: Sun, 22 Sep 2002 07:29:08 -0400
  • To: <mpls-ops@mplsrc.com>


MPLS over Ethernet: how do an MPLS switch learn next hop Ethernet
address in an LSP, where it already know the MPLS label toward the
switch.

When IP routers forwards an IP packet via Ethernet, the typically learn
the MAC address of next hop via the ARP protokol. Is a similar approach
defined in IETF, when an MPLS switch can send an MPLS-ARP request to
learn the mapping between MPLS label and Ethernet address ? Or is the IP
address always known for a next hop MPLS switch in an LSP, such that an
normal IP-ARP request can be sent ?.








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